Holding device



C. F. TELFOR ET AL Oct. 19, 1948.

HOLDING DEVICE 2 Sheets-Sheet 1 Filed Deg. 26, 1944 INVENTORJ CLARE/V05 f. ra ran CHAIJT/AN PALLFNBERQ THEIRATTORNEY Oct. 19, 1948. c. F. TELFOR ETAL 2,451,993

HOLDING DEVICE Filed Dec. 26, 1344 2 Sheets-Shee t 2 WWI/Q IA.

INVENTORS OI. ARM/0E F TEL FOR CHRIST/A ALL E/YBERG THE/R ATTORNEY Patented Oct. 19, 1948 "arr HOLDING DEVICE" ClarenceFt Telfonstafllair shores and Ghristian-e Pallenberg, Detroit, Mih.v

ApplicationDecember 26, 1944, Serial No. 569,983

4 Claims.- (01.279-1) 1 Our-"invention relates to a new and useful improvement in a holding ,zdevi'c'eadapted" primarily for holdin'ga gear centered while the bore-thereof is. being, ground orbored out or while the-peripheryof the hub thereof is'-be-- ing. turned down.

- It is an object of the present invention to-provide a holding device of this class whereby thegearwill be properly centered relative tothe turned-down. periphery or the reamed out bore.

Another object of the invention is the provision of a device of. this class-whereby the ob ject held may be easily and quickly clamped in fixed position.

Another objectof theinventionis the provision, of a holding device of this typewhich will.

be simple in structure, economicalof manufacture. durable. compact, easily and quickly operated, possessed of a minimum number of. parts.

sion'of' a holdingdevice of this type which may. be used to engage the workpiece externally and press the engaging balls radially inwardly or which. may be used to engage within the workpiece and force the engaging balls radially outwardly.

Another objectof. the invention is theprovision of a holding device having engaging-balls to bearagai-nst the teeth of: a-. gear andlso ar-' ranged and constructed that axial thrust will force; the engaging ballsat one end of the' 'rezt-ainer: into engaging. relation and then forcethe engaging balls and its retainer, together: with the object held, axially until an inclined face engages the other balls in the retainer and. forces them to' move radially; into engaging position.

Another objector. thei-invention is. the provision in". a holding 'devi'cezof this type of engaging ballsgand resilient .meansservingto "release-the balls from": engagement which forceswthenr into engagement;

Other objects will appear hereinafter.

Itsis recognized that various changes and moda ifi'cations; may be'made' in the detail of:--structure illustrated without; departing from. the invention 1 itself and it is intended that such changes andva-ri-ations shall zbe'zencompassed'. withinthe scope-z oi. the .c'laim'swhich' form i a part hereof.

Forming a: part of 'thisxspecificati'on are: draw-.

ingsin which),

Fig. 1 is a central, sectional view" oi-theiinvention;

Fig. 2 is a central,.; sectional" view of,- a modification;

3' is acentraLsectional view of the-1m:

vention showing a slight mo dification g.

Fig.4 is a fragmentary, sectional view illus-- trating the: retainer protector;

Figi; v i-S153 ifragmentary side elevational view of the structure shown in Fig. 4

Fig. 6 is; a. fragmentary sectional; viewillustratingjthetyperoi bail retainer. shown in' Figi 3 Fig. 7' is: a. fragmentary side elevational viewof the structureshown in Fig. 6;,

Fig. 8 is: fragmentary sectional view similar to Fig. 6, showing a slight modification;

Fig: 9 is-a:fragmentaryaelevational View of the structure shown in i Fig. 8;

Fig.5 10' is a-frag-rn-entary sectionalv-iew show-- ing. the invention used. on an intern algear Fig. 11 is a fragmentary elevational view of: the structureshown: Fig; 10; taken on line Fig. 12;. is. a.fragmentary-s-ectional- View show-x ing therinventiomused on a. plain-surface"body;-; Fig... 13 is-aafragmentary and elevational, view: of the structure'show-n in 12, taken on line l3-'l3 of 12.;: I

Fig l isrra?:fragmentary sectional view ofs'a further modification; 1

Fig. 15? is: asideelevationalview'ofthe structure shown-in: Fig. 145; taken'on "line: i5-l-5- of.

Fig. 16 :is a-rragmentary sectional view similar tor-Fig.. r2, excepting that the balls are-movin inwardly instead of outwardly;

Fig. 17 is a fragmentary end elevationalsviewzof trie -structure showndn Fig. 16; talszenon line pon. release'of pressure In the drawings, we have illustrated a supporting member I! on which is threaded a thrust cap l8. A bushing I9 is providedwhich is adapted to seat in the bore 20 of the support l1. Secured by suitable bolts 2| (see Fig. 6) to lie axially of and in engagement with the inner surface of the bushing 19 are the ball retainers 22 having pockets 23 in which are positioned balls 24. The construction is such that these retainers 22 engage between the teeth 25 of the gear 26. These retainers 22 are circumferentially spaced and preferably between each retainer is mounted a guard plate 21 (see Fig. 4) which is of greater length than the retainers 22. I When the gear 26 is positioned within the bore 28 of the bushing l9 and the thrust cap I8 is threaded into position, from an examination of Fig. 6, it will be obvious that as the thrust cap 18 moves into position, the inclined surface 29 on the thrust cap will engage the ball 24 which is outermost and force it inwardly against the inclined surface 30 on the retainer 22. These inclined surfaces will force the ball radially downwardy into engagement with the side faces of the teeth on opposite sides thereof, there being suiiicient play at the bottom of the pockets 23 to permit this movement. When the clamping relation thus eifected becomes tight enough, the bushin and the gear will be moved axially of the support I! until the innermost ball will engage the inclined surface 3| while in engagement with the inclined surface 32 and this ball will be forced inwardly into clamping relation. Since these sets of balls are positioned properly circumferentially spaced about the gear, it is obvious that a centering of the gear relative to the support will be effected and the gear will be held in tight position.

Surrounding the bushing are rings 33 and 34 of yieldable material, such as rubber or the like. As the nut or cap I8 is threaded on to move the various parts into proper operative position, these rings 33 and 34 will be subjected to pressure and compressed to a certain degree. While in this position, they serve as a means for sealing against leakage of dust and dirt into the mechanism. When the pressure is released, the will have a tendency to move the bushing axially so that the balls which are in close engagement with the inclined surfaces and pressed thereby will be relieved of this pressure and an easy and quick removal of the gear from the holding device may be accomplished.

In Fig. 2, we have shown a structure differing somewhat from the structure shown in Fig. 1. In this structure, the support Ila is provided with a spiral slot 31 into which project the pins 38 carried by'the hand wheel 39. These pins project into a nut 40 which serves the same purpose as the cap 18 by delivering thrust to the balls. A flange 4| serves as an abutment to engage the forward end of the bushing l9a. In the form shown in Fig. 1, the pressure is exerted from'the front. In the form shown in Fig. 2, the pressure is exerted from the rear.

In Fig. 3, we have shown a slight modification in which a workpiece 44 is mounted on the holding device and provided with an external gear 45 at one end and a non-toothed periphery at the other end; the cap I8!) is held in positionby the ring 46 and serves to cooperate with the support [1b to exert the necessary pressure on the holding device, the support being secured to a suitable base 48.

In Fig. 8, we have shown a modification in which a spring 48 serves as the retainer for the balls 24a, this spring member 49 being spaced from the bushing I90 by means of the spacer block 50, the balls lying between the teeth 5| of the gear 52.

In Fig. 10, we have shown the structure used with an internal gear 53 having the teeth 54. The inclined surfaces 55 are faced outwardly and when the cap l8d is threaded into position, the balls will be moved radially outwardly.

In Fig. 12, we have shown a structure somewhat similar to the structure shown in Fig. 10, excepting that the workpiece 60 is provided with a plain bore, the device being adapted for engaging such a workpiece.

In Fig. 14, we have shown a slight'modification in which the workpiece 13 is engaged on its periphery by the balls 14.

In Fig. 16, we have shown a structure similar to Fig. 12, excepting the balls surround the workpiece 6| and move radially inwardly to effect the clamping.

What we claim as new is:

l. A holding device of the class described adapted for holding a gear, comprising: a supporting member having a bore formed therein; a bushing mounted in said bore and movable axially thereof; a plurality of axially directed ball retainers mounted on said bushing in circumferential spaced relation and projecting radially inwardly from the inner face of said bushing and adapted for engaging between the teeth of a gear placed within said bushing; balls on each of said retainers and engaging between the teeth of the gear; a thrust member mounted on said supporting member and movable for delivering an axial thrust to said bushing; means for moving said balls radially upon axial movement of said bushing.

2. A holding device of the class described adapted for holding a gear, comprising: a supporting member having a bore formed therein; a bushing mounted in said bore and movable axially thereof; a plurality of axially directed ball retainers mounted on said bushing in circumferential spaced relation and projecting radially of said bushing; balls on each of said retainers engageable between the teeth of the gear; a thrust member mounted on said supporting member and movable for delivering an axial thrust to said bushing; and means for moving said balls radially upon axial movement of said bushing.

A holding device of the class described adapted for holding a gear, comprising: 'a supporting member having a bore formed therein; a bushing mounted in said bore and movable axially thereof; a plurality of axially directed ball retainers mounted on said bushing in circumferential spaced relation and projecting radially of said bushing; balls on each of said retainers engageable between the teeth of the gear; a thrust member mounted on said supporting member and movable for delivering an axial thrust to said bushing; and means for moving said balls radially upon axial movement of said bushing; and a plurality of circumferentially spaced axially directed guard members on said bushing between said ball retainers and of greater length than said ball retainers for limiting axial movement of said bushing.

4. A holding device of the class described comprising a supporting member having a bore formed therein; a bushing mounted in said bore and movable axially thereof and adapted for reception of a gear placed therein; a plurality of 5 6 axially directed ball retainers in circumferential REFERENCES CITED spaced relation and mounted on said bushing and projecting radially inwardly from the inner face thereof and engageable between the teeth of the The following references are of record in the file of this patent:

gear placed within said bushing; balls on each of 5 UNITED STATES PATENTS said retainers and adapted for engaging between Number Name t the teeth of a gear and engaging the same up n 336,437 Crone Nov. 20, 1906 axial movement of said bushing; a thrust m m r 1,021,011 Span-able Mar. 26, 1912 mounted on said supporting member and niov- 1 407 145 Gasteiner F b, 21, 1922 able for delivering an axial thrust to said bush- 1 1,664,085 N-aylon Mar. 27, 1928 m and means for moving said balls r d ally 1,300,291 Graves Apr. 14, 1931 upon axial movement of said lbu-shing. 12,040,601 Dunn May 12, 1936 CLARENCE F. TELFOR. CHRISTIAN PALLENBERG. 

